Forward Backward Pass Forward Backward Pass Forward pass

Forward & Backward Pass

Forward & Backward Pass • • • Forward pass – Earliest Times – Seberapa awal sebuah aktivitas dapat dimulai? (early start – ES) – Seberapa awal sebuah aktivitas dapat diselesaikan? (early finish – EF) – Seberapa awal sebuah proyek dapat diselesaikan? (time expected – TE) Backward pass – Latest Times untuk menghitung float. – Seberapa terlambat sebuah aktivitas dapat dimulai? (late start – LS) – Seberapa terlambat sebuah aktivitas dapat diselesaikan? (late finish – LF) – Berapa lama sebuah aktivitas dapat ditunda? (slack or float – SL) Aktivitas-aktivitas mana yang merepresentasikan jalur kritis/critical path (CP)?

Activity-on-Node Network Forward Pass 20 15 35 20 15 10 EF 200

Activity-on-Node Network Backward Pass 185 20 185 5 10 20 15 20 LS

Network Using Lags Lag 10 Lag 5 Lag 10 Legend Lag 5 Lag 10

Hammock Activity Example Legend

Exercise: Project Network Diagram (1) • J. Wold, project manager of Print Software, Inc. , wants you to: – prepare a project network; – compute the early, late, and slack activity times; – determine the planned project duration; and – identify the critical path. • His assistant has collected the following information for the Color Printer Drivers Software Project

Exercise: Project Network Diagram (2) Act. ID Description Predecessor Time Unit A External Specifications None 8 B Review Design Features A 2 C Document New Features A 3 D Write Software A 60 E Program and Test B 60 F Edit and Publish Notes C 2 G Review Manual D 2 H Alpha Site E, F 20 I Print Manual G 10 J Beta Site H, I 10 K Manufacture J 12 L Release and Ship K 3
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